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Published in Journal of The Washington Academy of Sciences, in 1913, in volume 3, pages 16-19

Published in Journal of The Washington Academy of Sciences, in 1913, in volume 3, pages 145-149

Published in Journal of The Washington Academy of Sciences, in 1913, in volume 3, pages 180-190

Published in Journal of the Washington Academy of Sciences, in 1913, in volume 3, pages 432-444

Published in Journal of The Washington Academy of Sciences, in 1913, in volume 3, issue 4, pages 103-109

Published in Journal of The Washington Academy of Sciences, in 1913, in volume 3, issue 5, pages 138-143